The measured office/shop block Phaneromeni Estate is located at the end of Ledras Street in Nicosia. The measurements were performed on the 29th of November 2007 at 09:10 am. Substation Phaneromeni is situated in the car park, at the basement of the main building and the investigated security room is located next to the right side of the substation.
Limiting exposure values have been provided by the ICNIRP recommendations and are guidelines to many countries and organizations. The exposure limits at 50 Hz are tabulated in the following table according to the limits given by ICNIRP.
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Reference levels for Occupational exposure ICNIRP |
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Frequency |
Electric Field Strength, E (V/m) |
Magnetic Field Strength, H (A/m) |
Magnetic Flux Density, B (µT) |
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50 Hz |
10000 |
400 |
500 |
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Reference levels for General Public exposure ICNIRP |
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Frequency |
Electric Field Strength, E (V/m) |
Magnetic Field Strength, H (A/m) |
Magnetic Flux Density, B (µT) |
|
50 Hz |
5000 |
80 |
100 |
Table 1: ICNIRP Exposure limits for Occupational and General Public exposure
The obtained results for the RMS fields inside and outside the substation are shown in tables 2 and 3 respectively. A comparison is also made with the ICNIRP recommendations.
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Inside Field Measurements - Security room |
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Distance from Side /m |
Maximum Magnetic Field at Z Height /m - Percentage of ICNIRP General Public Standard /% |
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0.3m |
ICNIRP % |
1m |
ICNIRP % |
1.75m |
ICNIRP % |
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Plot Field Measurements |
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Measurement point A |
-- |
-- |
-- |
-- |
34.8 |
34.8% |
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Measurement point B |
-- |
-- |
-- |
-- |
26.2 |
26.2% |
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Measurement point C |
-- |
-- |
-- |
-- |
3.14 |
3.14% |
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Measurement point D |
-- |
-- |
10.74 |
10.74% |
-- |
-- |
|
Measurement point E |
-- |
-- |
27.30 |
27.30% |
-- |
-- |
|
Measurement point F |
-- |
-- |
4.70 |
4.70% |
-- |
-- |
Table 3: Magnetic Field Measurements inside area
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Outside Field Measurements |
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Distance from Side /m |
Maximum Magnetic Field at Z Height /m - Percentage of ICNIRP General Public Standard /% |
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0.3m |
ICNIRP % |
1m |
ICNIRP % |
1.75m |
ICNIRP % |
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Substation right Field Measurements |
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0m from Front Side |
0.3048 |
0.30% |
0.3389 |
0.84% |
0.3406 |
0.34% |
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1m from Front Side |
0.1694 |
0.17% |
0.1481 |
0.15% |
0.1379 |
0.14% |
|
2m from Front Side |
0.1122 |
0.11% |
0.1366 |
0.14% |
0.1115 |
0.11% |
|
3m from Front Side |
0.0887 |
0.09% |
0.0918 |
0.09% |
0.0881 |
0.09% |
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Substation front side Field Measurements |
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0m from Right Side |
12.80 |
12.80% |
3.04 |
3.04% |
2.16 |
2.16% |
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1m from Right Side |
1.89 |
1.89% |
1.50 |
1.50% |
0.91 |
0.91% |
|
2m from Right Side |
0.64 |
0.64% |
0.54 |
0.54% |
0.39 |
0.39% |
|
3m from Front side |
0.25 |
0.25% |
0.21 |
0.21% |
0.19 |
0.19% |
Table 4: Magnetic Field Measurements in the outside area